Date: Mon, 29 Jan 2001 06:02:10 -0800 From: Peter Wemm <peter@netplex.com.au> To: Brian Somers <brian@Awfulhak.org> Cc: freebsd-arch@FreeBSD.ORG Subject: Re: Cloned open support Message-ID: <200101291402.f0TE2A451479@mobile.wemm.org> In-Reply-To: <200101291052.f0TAqVK58112@storm.FreeBSD.org.uk>
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Brian Somers wrote: > Hi, > > I'm considering having a crack at adding support for cloned opens. > Before I start, I guess I've got two questions: > > 1. Is anybody else doing this. > > 2. Given that I'll need to change the d_open prototype (and > thus cdevsw), I'm going to affect every device driver in the > tree - although only changing the first arg to a (dev_t) > pointer, making things pretty easy to change and not too > unexpected for anyone that's written sysv drivers. Not necessary. dev_t *is* a pointer. Add a flag to the device flags to indicate that it allows clone opens, and maybe teach specfs a little about it (ie: that the unit will be reassigned on a clone open) and you're done. Cheers, -Peter -- Peter Wemm - peter@FreeBSD.org; peter@yahoo-inc.com; peter@netplex.com.au "All of this is for nothing if we don't go to the stars" - JMS/B5 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message
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